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Method and System for Determining an Optimal Steering Angle in Understeer Situations in a Vehicle

a technology of optimal steering angle and vehicle, which is applied in the direction of steering initiation, vessel construction, instruments, etc., can solve the problem that the driver is not provided with any feedback about the maximum possible lateral force, and achieve the effect of reliable assistance in stabilizing the vehicl

Inactive Publication Date: 2009-12-24
CONTINENTAL TEVES AG & CO OHG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]The system for controlling electronically controllable motors in the steering train advantageously permits the driver to set the maximum lateral force value in understeering situation by means of power steering. This assistance during steering allows the vehicle to be stabilized in critical driving situations. All wheel steering systems are taken into account here.

Problems solved by technology

A disadvantage with this concept is that the driver is not provided with any feedback about the maximum possible lateral force.

Method used

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  • Method and System for Determining an Optimal Steering Angle in Understeer Situations in a Vehicle
  • Method and System for Determining an Optimal Steering Angle in Understeer Situations in a Vehicle
  • Method and System for Determining an Optimal Steering Angle in Understeer Situations in a Vehicle

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Embodiment Construction

[0030]The description is based on a two-axle, four-wheel motor vehicle having steerable wheels on at least one front axle 10 and, if appropriate, also on a rear axle 12. FIG. 1 is a schematic illustration of a vehicle having a steering actuator. A steering wheel 20 which is attached to a steering column 18 is connected via a steering gear 22 to the steered wheels 24, 26 of the vehicle. The steering gear 22 is preferably embodied as a toothed rack steering system which has a pinion (not illustrated), which is connected to the steering column in a rotationally fixed fashion. A torque sensor 14, which determines the driver's steering request here by means of a manual steering toque MH is arranged on the steering column. An electrical EPS servomotor 16 (EPS=Electric Power Steering) applies an additional steering torque MDSR to the steering train during conventional operation, which steering torque MDSR increases the steering torque MH applied by the driver.

[0031]In order to set an addit...

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Abstract

A method for determining an optimal steering angle in understeer situations of a vehicle is described. To assist a driver in reliably stabilizing the vehicle during an understeer situation while driving, a model-based driving traction coefficient factor, a model-based kinematic factor, and a float angle are taken into account in the determination of a steering angle. A limited steering angle δv,lim at which a maximum lateral force is set, is determined by addition of the driving traction coefficient factor, the kinematic factor, and the float angle. A system suitable for implementation of the method is also described.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the U.S. national phase application of PCT International Application No. PCT / EP2007 / 054125, filed Apr. 26, 2007, which claims priority to German Patent Application No. DE102006020279.1, filed Apr. 27, 2006 and German Patent Application No. DE102007020169.0, filed Apr. 26, 2007, the contents of such applications being incorporated by reference herein in their entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a device and method for determining an optimum steering angle in understeer situations of a vehicle.[0004]2. Description of the Related Art[0005]Modern vehicles use electronically controllable motors in the steering train in order, on the one hand, to selectively influence the steering torque to be applied by the driver (power steering systems) and, on the other hand, to selectively set steering angles independently of the driver (superimposition steering systems). In ...

Claims

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Application Information

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IPC IPC(8): B62D6/00
CPCB60W50/16B62D6/003B62D7/159B62D6/008B62D6/006B60W30/045
Inventor LAUER, PETERRASTE, THOMAS
Owner CONTINENTAL TEVES AG & CO OHG